2. you need to tell them that never knock your door again first, before you 報警
2. ckeck your state law about niose. here is a example of the law:
"Residential disturbance.
"Residential disturbance" means a gathering of more than one (1)
person at a residential property located in a single family or
multifamily zone, as defined in SMC Section 23.84A.048 between the
hours of ten o'clock (10:00) p.m. (eleven o'clock (11:00) p.m. on
Friday and Saturday nights) and seven o'clock (7:00) a.m. at which
noise associated with the gathering is frequent, repetitive or
continuous and is audible to a person of normal hearing at a distance
of seventy-five (75) feet or more from the property."